Kato K, Hanai T
Nissan Research Center, Nissan Motor Co., Ltd., Yokohama, Japan.
Ind Health. 1998 Apr;36(2):107-11. doi: 10.2486/indhealth.36.107.
The effect on discomfort of the frequency and the backrest angle of x-axis (fore-and-aft) vibration of backrest have been studied. The method of adjustment was employed to obtain contours of equivalent comfort for three types of rigid backrests, whose surface were vertical, inclined 20 degrees and 40 degrees from vertical. Eighteen subjects were required to adjust test vibration over the frequency range 2-80 Hz to produce discomfort equivalent to that caused by 10 Hz 0.25 m/s2 r.m.s. sinusoidal reference vibration for each backrest. The direction of vibration was perpendicular to backrest surface. Results shows that the sensitivity at 20 and 40 Hz on inclined backrests is significantly about 1.4 to 1.5 times greater than that on a vertical backrest (p < 0.01) but there is no significant difference between the two contours for inclined backrests. The contour for a 'vertical' backrest obtained in this experiment agrees with the contour calculated from the frequency weighting factors for x-axis back vibration, Wc, in ISO2631-1, but the contours for inclined backrests do not agree with the contour well.
研究了靠背在x轴（前后）方向振动的频率和靠背角度对不适感的影响。采用调整方法获取了三种刚性靠背的等效舒适度等值线，这三种靠背的表面分别为垂直、与垂直方向倾斜20度和40度。要求18名受试者在2 - 80Hz的频率范围内调整测试振动，以使每种靠背产生的不适感与10Hz、0.25m/s²均方根值的正弦参考振动所引起的不适感相当。振动方向垂直于靠背表面。结果表明，倾斜靠背在20Hz和40Hz时的敏感度明显比垂直靠背高出约1.4至1.5倍（p < 0.01），但两种倾斜靠背的等值线之间没有显著差异。本实验中获得的“垂直”靠背的等值线与根据ISO2631 - 1中x轴靠背振动的频率加权因子Wc计算出的等值线一致，但倾斜靠背的等值线与该等值线不太相符。
